sion frequencies, and persistence frequencies were performed for each of the sites designated in Table 3 and extensive computer generated tabular data are presented in Ref. (10). The calculational results clearly demonstrate the marked influence meteorological conditions have on laser propagation. Indeed, operational procedures and siting criteria must be much different for power transmission employing laser radiation rather than microwaves. This analysis leads to a reformulation of these requirements so that laser power transmission can achieve power-availability levels at the commercial grid equivalent to those for the microwave-SPS concept and conventional electric-power plants. This performance is believed to be feasible within constraints imposed by safety and environmental considerations. A comparison of the annual power availability for the various U.S. regions is shown in Fig. 2. The low end of the range corresponds to average results for model 1,
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